作　　者： ; ; ; (李德鑫）;

机构地区： 空军航空大学航空电子工程系

出　　处： 《吉林大学学报（信息科学版）》 2008年第3期238-243,共6页

摘　　要： 为有效解决跳频信号的检测问题,根据跳频信号功率谱随时间变化的差异性,提出一种基于功率谱对消的跳频信号检测算法。该算法可在无需已知先验知识的条件下,对较低信噪比的跳频信号进行盲检测。通过仿真分析表明,该算法在信噪比为10 dB的条件下,可获得功率对消比为-34 dB的检测效果;在较大接收信噪比、较多分段数和切比雪夫函数窗条件下,该算法具有较高的检测性能。此外,在跳频信号和定频信号发生频率碰撞时,该算法仍能实现对跳频信号的检测,更加适合于现代战场的复杂电磁环境。 In order to solve the problems in detection of frequency-hopping signals,a new method for frequency-hopping signals detection based on power spectrum elimination is proposed,which uses the difference of the power spectrum between the frequency-fixed signals and frequency-hopping signals along with the time variety.The measure realizes the blind detection for any modulation mode of low SNR（Signal-to-Noise Ratio） by the enactment of the threshold without previous information.Emulation results have indicated that the elimination ratio is-34 dB when SNR is 10 dB,the arithmetic has better parameter estimation ability when it adopts the higher SNR,larger FFT（Fast Fourier Transform） segment number and the chebyshev window character.The arithmetic is suitable for the modern battlefield and practical significance for the electronic detection with the merits that it can solve the detection issue when the frequencies between the frequency-fixed signals and frequency-hopping signals have impacted with each others.

关 键 词： 功率谱 信号检测 跳频 通信仿真

领　　域： [电子电信] [电子电信]